Purpose

The pin fin is applied into a Lamilloy cooling structure which is broadly used in the leading edge region of the modern gas turbine vane. The purpose of this paper is to investigate effects of the layout, diameter and shape of pin fins on the flow structure and heat transfer characteristics in a newly improved Lamilloy structure at the leading edge region of a turbine vane.

Design/methodology/approach

A numerical method is applied to investigate effects of the layout, diameter and shape of pin fins on the flow structure and heat transfer characteristics in a newly improved Lamilloy structure at the leading edge of a turbine vane. The diverse locations of pin fins are Lp = 0.35, 0.5, 0.65. The diameter of the pin fins varies from 8 mm to 32 mm. Three different ratios of root to roof diameter for pin fins are also investigated, i.e. k = 0.5, 1, 2. The Reynolds number ranges from 10,000 and 50,000. Results of the flow structures, heat transfer on the target surface and pin fin surfaces, and friction factor are studied.

Findings

The heat transfer on the pin fin surface gradually decreases and then increases as the location of the pin fins increases. Increasing the diameter of the pin fins causes the heat transfer on the pin fin surface to gradually increase, while a lower value of the friction factor occurs. Besides, the heat transfer on the pin fin surface at a small root diameter increases remarkably, but a slight heat transfer penalty is found at the target surface. It is also found that both the Reynolds analogy performance and the thermal performance are increased compared to the baseline whose diameter and normalized location of pin fins are set as 16 and 0.5 mm, respectively.

Social implications

The models provide a basic theoretical study to deal with nonuniformity of the temperature field for the turbine vane leading edge. The investigation also provides a better understanding of the heat transfer and flow characteristics in the leading edge region of a modern turbine vane.

Originality/value

This is a novel method to adopt pin fins into a Lamilloy cooling structure with curvature. It presents that the heat transfer of the pin fin surface in a pin-fin Lamilloy cooling structure with curvature can be significantly increased by changing the parameters of the pin fins which may lead to various flow behavior. In addition, the shape of the pin fin also shows great influence on the heat transfer and flow characteristics. However, the heat transfer of the target surface shows a small sensitivity to different layouts, diameter and shape of pin fin.

中文翻译：

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关于具有不同销鳍结构的曲率的Lamilloy冷却结构的传热特性

目的

针状翅片应用于Lamilloy冷却结构中，该结构广泛用于现代燃气轮机叶片的前缘区域。本文的目的是研究针状鳍片的布局，直径和形状对涡轮叶片前缘区域新改进的Lamilloy结构中的流动结构和传热特性的影响。

设计/方法/方法

应用数值方法研究针翼的布局，直径和形状对涡轮叶片前缘处新改进的Lamilloy结构中的流动结构和传热特性的影响。引脚鳍的不同位置为Lp = 0.35、0.5、0.65。翅片的直径从8毫米到32毫米不等。还研究了针状翅片的三种不同的根部与顶部直径之比，即k = 0.5、1、2。雷诺数范围为10,000和50,000。研究了流动结构，目标表面和销鳍表面上的热传递以及摩擦系数的结果。

发现

销鳍表面上的热传递逐渐减少，然后随着销鳍位置的增加而增加。增大针状翅片的直径导致在针状翅片表面上的热传递逐渐增加，同时出现较低的摩擦系数值。此外，在小根径处的销翅片表面上的热传递显着增加，但是在目标表面处发现轻微的热传递损失。还发现，与基线相比，雷诺的类比性能和热性能都得到了提高，基线的直径和销鳍的归一化位置分别设置为16和0.5 mm。

社会影响

这些模型为处理涡轮叶片前缘温度场的不均匀性提供了基础理论研究。该研究还提供了对现代涡轮机叶片前缘区域中的传热和流动特性的更好理解。

创意/价值

这是一种将针状鳍片采用到具有曲率的Lamilloy冷却结构中的新颖方法。结果表明，通过改变销翅片的参数可以显着增加具有曲率的销翅片Lamilloy冷却结构中的销翅片表面的热传递，这可能导致各种流动行为。此外，针状翅片的形状也对传热和流动特性产生很大的影响。但是，目标表面的热传递对针状鳍片的不同布局，直径和形状显示出较小的敏感性。